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1, Sella-Nasion to A Point angle (SNA); 2, sella-nasion to B point angle (SNB); 3, A point-Nasion to B point angle (ANB); 4, upper incisor to Frankfort plane angle (U1-FH); 5, lower incisor to mandibular plane angle (IMPA); 6, menton deviation-the distance from the perpendicular bisector line of both frontozygomatic points (FZPs) to the menton.
